Photo-chemical generation of stable fluorescent derivatives of Rhodamine B

Inactive Publication Date: 2000-02-22
D DATA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The advantage of the present invention lies in the fact that the reading process can be carried out by excitation of the recording medium at 600 nm, and thus the modern miniature diode lasers can be employed.
The active medium in accordance with the present invention can be advantageously implemented in the process of 2 photon writing by virtue of a set-up as shown in FIG. 2.
Two laser beams LB1 and LB2 from two respective laser sources (not shown) are selectively directed onto the layer of polymeric film F constituting a matrix carrying an active medium incorporated therein. The composition of this medium is chosen in accordance with the present invention. The first beam is produced by a cylindrical lens CL and the second beam is produced by a diode laser DL. The second beam can be deflected by virtue of deflectors Def1 and Def2. The film is transparent to the electromagnetic radiation at least in some parts of the spectrum. The intersection of beam LB1

Problems solved by technology

Unfortunately the known in the art materials employed

Method used

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  • Photo-chemical generation of stable fluorescent derivatives of Rhodamine B
  • Photo-chemical generation of stable fluorescent derivatives of Rhodamine B

Examples

Experimental program
Comparison scheme
Effect test

example 2

In this example the mixture containing 0.0115 g of lactam D1, 0.0025 g of CBr.sub.4, 1.1 cm.sup.3 of toluene and 1 cm.sup.3 of 2% solution of polystyrene in CHCI.sub.3 have been deposited with the aim of applicator on the glass slide and was allowed to evaporate for 3-4 hours.

Afterwards the ready film having thickness 5 microns was irradiated by high pressure Hg-lamp with light 320-360 nm (glass filter UFS-1) for 2 minutes. The photoinduced photo-coloration with D.sub.563 =1.08 has been got. The irradiated film was allowed to evaporate for 1 hour at 70.degree. C. and for 30 minutes at 90.degree. C. After the treatment the film was kept 4 months in dark place at room temperature. The change in photo-induced optical density (D.sub.563 =1.08) was less than 0.05%.

Thus writing of information can be implemented by causing the Rhodamine-B lactam to absorb the irradiated light and to transform into a Rhodamnine derivative.

The process of reading of the recorded information can be implemented...

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Abstract

The present invention relates to the field of optical recording materials, in particular, fluorescent compounds and matrices suitable for use in optical memory systems, including three dimensional optical memory systems for READ ONLY MEMORY (ROM). In particular, nonfluorescent Rhodamine B lactams are photochemically transformed into fluorescent Rhodamine B derivatives.

Description

The present invention relates to the field of optical recording materials, in particular, fluorescent compounds and matrices suitable for use in optical memory systems, including three dimensional optical memory systems for READ ONLY MEMORY (ROM).Information storage and optical recording systems are of rapidly increasing importance in the modem society in view of the exponential rise in the number and complexity of the data which must be recorded and be retrievable so as to handle the increasing everyday business workload, and to assist efficiently enough in scientific development.Many optical information storage systems, including those based on silver halide emulsions and the like, have contributed significantly to this development, generally because of the high packing density combined with good resolution of information retrieve inherent to such systems. The advantage of READ ONLY MEMORY devices, based on photochemical generation of fluorescent compounds lies in the fact that st...

Claims

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Application Information

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IPC IPC(8): G03C1/73G11C13/04G11C13/02G11B7/244G11B7/24G11B7/0045G11B7/00C09K11/06
CPCB82Y10/00G03C1/73G11B7/244G11C13/0014G11C13/0016G11C13/04G11B7/00455G11B7/08G11B2007/24624Y10S430/146
Inventor SOKOLUK, NATALIA T.SHUBIN, VLADIMIR V.LEVICH, EUGENE B.MALKIN, JACOB N.
Owner D DATA
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